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Host Range of Strains of Pseudomonas syringae pv. tagetis. N. H. Rhodehamel, Department of Plant Pathology, University of Wisconsin, Madison 53706. R. D. Durbin, USDA, ARS, Department of Plant Pathology, University of Wisconsin, Madison 53706. Plant Dis. 69:589-591. Accepted for publication 16 January 1985. This article is in the public domain and not copyrightable. It may be freely reprinted with customary crediting of the source. The American Phytopathological Society, 1985. DOI: 10.1094/PD-69-589.

Using different inoculation techniques, the host range was determined for Pseudomonas syringae pv. tagetis strains isolated from marigold, sunflower, common ragweed, Jerusalem artichoke, and a presumptive strain from dandelion. Wound inoculation induced apical chlorosis in all hosts except dandelion, which exhibited no symptoms. With spray inoculation, ragweed became infected but only with strains isolated from this host; other hosts, except dandelion, exhibited leaf spots and apical chlorosis with all strains. Dandelion became temporarily chlorotic only when the inoculum was infiltrated into the leaf with a hypodermic syringe. Despite its apparent inability to infect dandelion, this strain appears to be pv. tagetis based on the distinctive symptoms it induces on marigold, its microbiological characteristics, and its fatty acid ester profile.